linux-kernel - Re: [PATCH 1/2] ARM: Dove: Add the audio devices in DT

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Date:	Wed, 28 Aug 2013 12:26:31 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC:	Jean-Francois Moine <moinejf@...e.fr>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Ian Campbell <ian.campbell@...rix.com>
Subject: Re: [PATCH 1/2] ARM: Dove: Add the audio devices in DT

On 08/28/2013 12:19 PM, Thomas Petazzoni wrote:
> Sebastian, Jean-François,
>
> On Wed, 28 Aug 2013 12:13:07 +0200, Sebastian Hesselbarth wrote:
>> On 08/28/2013 11:34 AM, Jean-Francois Moine wrote:
>>> This patch adds the nodes to instantiate the audio devices of the Dove
>>> boards.
>>>
>>> Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>
>>> ---
>>>    arch/arm/boot/dts/dove.dtsi                  | 18 ++++++++++++++++++
>>>    1 file changed, 18 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/dove.dtsi b/arch/arm/boot/dts/dove.dtsi
>>> index 499abad..78227e2 100644
>>> --- a/arch/arm/boot/dts/dove.dtsi
>>> +++ b/arch/arm/boot/dts/dove.dtsi
>>> @@ -573,6 +573,24 @@
>>>    					phy-handle = <&ethphy>;
>>>    				};
>>>    			};
>>> +
>>> +			i2s0: audio-controller@...00 {
>>> +				compatible = "marvell,mvebu-audio";
>>
>> [added Gregory to Cc]
>>
>> Jean-Francois,
>>
>> as Mark Brown already took the bindings patch for above generic
>> compatible, how are we going to discriminate different
>> implementations/features of Dove, Kirkwood, and Armada 370?
>
> I agree that mvebu-audio is not a really good compatible string. It
> should use the first SoC that introduced the IP block, so that if
> future SOCs have variations, we can introduce separate compatible
> strings.
>
> So for now, the compatible string should be kirkwood-audio.

Unfortunately, mvebu-audio has already been taken by Mark. Also, we
know the differences for the three SoCs now and should have a compatible
for each (and maybe mvebu-audio for fallback).

Also, we'll need to distinguish between the different audio controllers
on a single SoC, i.e. i2s0 and i2s1. I suggest checking the (phys) reg
base passed.

Sebastian
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